31
Troubleshooting the Millivolt Gas Control System
Problem
Possible Causes
Corrective Action
Defective or misaligned
electrode at pilot.
Check for spark at electrode and pilot: if no spark
and electrode wire is properly connected, replace
igniter.
Spark igniter will not
light.
Defective igniter (push-
button).
Using a match, light pilot. If pilot lights, turn off pilot
and push the red button again. If pilot will not light -
check gap at electrode and pilot should be 1/8" to
1/4" to have a strong spark.
Defective thermocouple
(flame switch where
applicable).
Check pilot flame. Must impinge on generator and
thermocouple. Clean and/or adjust pilot for
maximum flame impingement on generator and
thermocouple. Replace thermocouple if pilot will not
hold. (Hand tight 1/8 turn on replacement)
Pilot will not stay lit
after carefully following
lighting instructions.
Defective valve magnet.
Replace valve, if pilot won't hold after the
thermocouple is replaced.
Wall switch or wires
defective.
Check wall switch and wires for proper connections.
Jumper wire across terminals at wall switch. If
burner comes on, replace defective wall switch. If
okay, jumper wires, across wall switch wires at
valve. If burner comes on, wires are faulty or
connections are bad.
Generator may not be
generating sufficient
voltage.
Check generator with millivolt meter. Take reading at
generator terminals of gas valve. Should read 325
millivolts minimum while holding valve knob
depressed in pilot position and wall switch "off"
Replace faulty generator if reading is below
specified minimum.
Plugged burner orifice.
Check burner orifice for stoppage and remove.
Pilot burning, no gas to
burner, valve knob
“ON”, and wall switch
“ON”.
Defective automatic valve
operator.
Remove wall switch wires from gas valve. Install
jumper wires from top bottom terminals of gas valve.
Turn valve on "ON". If main burner does not light,
replace valve.
Frequent pilot outage
problem.
Pilot flame may be too low
or blowing (high) causing
the pilot safety to drop out.
Clean and/or adjust pilot flame for maximum flame
impingement on generator and thermocouple.
Flame lifts off burner
and goes out in less
than 30 seconds.
Inner 4” liner has come off
flue or termination, flame
is starving for oxygen.
Attach 4" liner to flue or termination using screws,
silicone and clamps as stated in manual.
Flame lifts off burner
on one side while the
rest of the flame
remains lit.
Improper installation of
firebrick. Firebrick is likely
leaning.
Be sure to position firebrick against firebox walls and
be sure to use brick clips attached to the inner side
of firebox.
Burner System Maintenance
It is recommended to annually inspect and clean the Burner System to prevent malfunction and / or sooting. This operation
should be performed by your dealer or a qualified technician.
-CAUTION-
Before servicing the burner system ensure that the gas supply is turned OFF and disconnect all electrical
connections to the appliance. Allow the appliance to cool to room temperature. Note that the pilot assembly
may be hot in an intermittent or standing-pilot system—even if the main burner was never on. Exercise
caution when working within the area.
-ALL WORK SHOULD BE PERFORMED BY A QUALIFIED AND CERTIFIED TECHNICIAN-
WARNING: BEFORE DOING ANY GAS CONTROL SERVICE WORK, REMOVE THE GLASS FRONT.
NOTE: Before troubleshooting the gas control system, be sure external gas shut off is in the "On" position.
Summary of Contents for Marquis Infinite MQRB5143LP
Page 30: ...30 Millivolt System Lighting and Burner Control...
Page 39: ...39...
Page 41: ...41 Photos Bottom of Unit with IPI Module Light Module IPI Valve...
Page 42: ...42 Close up View of IPI Module Inside of IPI Module...
Page 43: ...43 IPI Valve IPI Valve...
Page 44: ...44 Millivolt Valve Light Module Millivolt Valve...
Page 49: ...49 Venting Examples All horizontal runs have a minimum rise per foot...
Page 57: ...57 Warranty...
